Question

I’m trying to work out whether my webforms Page is a certain type.

I’ve got a number of base classes that inherit one another:

BasePage -> System.Web.UI.Page
CMSPage -> BasePage
Page -> CMSPage

In a custom UserControl, I need to get the the page, but only if it’s derived from CMSPage.

I’ve tried:

if(Page.GetType() == typeof(CMSPage))

But the value of GetType() just returns the class name of the page. It looks like I need to do:

if(Page.GetType().BaseType.BaseType == typeof(CMSPage))

To get the match working. However, some pages are at different BaseType levels before it reaches the type of CMSPage.

I could create a function like this to loop through each BaseType until it found the right one:

public static bool IsPageTypeOf(this System.Web.UI.Page page, Type targetType)
{
    var pageType = page.GetType();
    if (pageType == targetType)
        return true;
    while (pageType.BaseType != null)
    {
        if (pageType.BaseType == targetType)
            return true;
        pageType = pageType.BaseType;
    }
    return false;
}

But it feels messy. Is there a better way to do this?

Answer 1

Are you looking for:

return targetType.IsAssignableFrom(page.GetType());

Or if you know the type at compile time:

if (page is MyPageType)

Or:

MyPageType myPage = page as MyPageType;
if (myPage != null)
{
    // Use myPage
}